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Rock House Wall repair

My house was built in 1905 out of Basalt rock. We had put a swamp cooler in a window & it seems the water from the cooler seeped into the rock and then into the wall causing the paint and all the layers underneath to peel up. There was a couple spots of mold that I cleaned with bleach. But now I have this HUGE 6 foot patch that I have no clue how to patch. There is no drywall it looks like cement.

Re: Rock House Wall repair

I think you may need NHL 5 (Natural Hydraulic Lime) It would be used for repointing the joints and parging walls also used like you would for plastering and stucco.
Check the following producters.
LIME WORKS.US
VIRGINIA LIME WORKS
Also check your local area for St. Astier Lime products.